Acoustic Audio WS1005 Passive Subwoofer Amp 200 Watt Amplifier for Home Theater To be used with Passive Subwoofers only ,In Wall or In Ceiling Home Entertainment,Home Theater Systems,Industrial Sound Systems ,Multiple Room Systems Power Amplifier Output: 200 Watts, Low Bass Frequency Response of 50  200 Hz +/- 3dB Output Impedance: 4-8 ohm Sub volume and crossover control knobs LFE and RCA Inputs for use from a home audio receiver. Raw wire outputs.